FEBCO 765 Retainer & Check Assembly Breaking

I just sent an email to FEBCO concerning this, but thought I'd ask here as well.

Every year when I blow out the irrigation system I find that the little tabs on the retainers break off, as do the legs on the check assembly because of corrosion in the FEBCO 765 BFP. So, I'm wondering if FEBCO make stainless steel Retainers for the 765 BFP instead of the bronze/brass material? Same question applies for the "legs" on the check assembly.
When they break off they frequently lodge themselves in the diaphragm seal & cause valve leakage. I have purchased some 0.038” stainless steel sheet stock and plan on making some Retainers, but would prefer to purchase from FEBCO if they do make them. Does anyone know if FEBCO, or alternate source makes these components in stainless steel for the ¾” 765 BFP?

PS I have a PH Neutralizing system to control the PH to 7.0 in my well water, so the corrosion shouldn't be caused by the water, unless there are certain minerals in the water that could cause this. Yet, having the water tested several times over the past 20 years with no negative results would also suggest that minerals are not the problem.

I would appreciate your comments as this is expensive having to replace these costly little components every year.

Ok,
First I understand your frustration.
Second, You may want to pull out those parts before your winterize the system or take them out all together for the winter.
Third, They are probably breaking from high pressure or water hammer situation.
Fourth, Don't Modify any parts for the backflow preventer as you will void any protections and warranty for the Backflow Preventer.

If you are unhappy with the Febco 765, buy a Watts 800M4, Wilkins 720A, or Apollo PVB4A. I personally prefer the Watts 800M4 and Apollo PVB 4A because they have replaceable seats for the check valve.

If you are concerned with blowing air through the backflow preventer, then use an air connection downstream of the backflow preventer, even if it means you have to plumb it in. Any PVB can be manually drained of water, without air applied to it.